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arXiv 1605.09424astro-ph.GA
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用增强的F检验探测2型类星体的微变

Detecting microvariability in type 2 quasars using enhanced F-test

J. Polednikova, A. Ederoclite, J. A. de Diego, J. Cepa, J. I. González-Serrano, A. Bongiovanni, I. Oteo, A. M. Pérez García, R. Pérez-Martínez, I. Pintos-Castro… 展开作者

J. Polednikova, A. Ederoclite, J. A. de Diego, J. Cepa, J. I. González-Serrano, A. Bongiovanni, I. Oteo, A. M. Pérez García, R. Pérez-Martínez, I. Pintos-Castro, M. Ramón-Pérez, M. Sánchez-Portal

摘要:

微变(夜间变化)是短时间尺度(即小时)的低幅度通量变化。它已经在未被遮蔽的1型活动星系核和耀变体中被探测到。然而,在2型活动星系核中,探测受到可能的可变核和宿主星系之间的低对比度的阻碍。在本文中,我们提出了一个在四个2型类星体的样本作为一个天体统计问题的微变搜索。我们正在探索使用de Diego 2014提出的新引入的增强型F检验。所呈现的结果表明,在我们观察到的四个目标中,我们能够将这种统计方法应用于其中三个。在类星体J 0802 +2552的情况下,在所有使用的过滤器中,微观变化的证据是清楚的。(g ',r'和i ')在两个观测夜期间,在一个滤波器(i')中的J1258+5239的观测夜之一中存在微变化,而对于J1316+4452,有证据表明,在一个夜晚和两个过滤器(R'和I')期间,我们的检测水平存在微小变化。我们证明了增强的F-检验的可行性,以检测微变遮蔽2型类星体。在本文的最后,我们讨论了微观变异的可能原因。其中一个选择是对目标的错误分类。根据目前对环核区域的看法,解释这一现象的一个可能的方案是在一种cluronically模糊的介质中存在光学上薄的间隙。在目标的合并状态和微变异性的检测之间可能存在有趣的联系。

英文摘要:

Microvariability (intra-night variability) is a low amplitude flux change at short time scales (i.e. hours). It has been detected in unobscured type 1 AGNs and blazars. However in type 2 AGNs, the detection is hampered by the low contrast between the presumably variable nucleus and the host galaxy. In this paper, we present a search for microvariability in a sample of four type 2 quasars as an astrostatistical problem. We are exploring the use of a newly introduced enhanced F-test, proposed by de Diego 2014. The presented results show that out of our four observed targets, we were able to apply this statistical method to three of them. Evidence of microvariations is clear in the case of quasar J0802+2552 in all used filters (g',r' and i') during both observing nights, the microvariations are present in one of the nights of observations of J1258+5239 in one filter (i'), while for the J1316+4452, there is evidence for microvariability within our detection levels during one night and two filters (r' and i'). We demonstrate the feasibility of the enhanced F-test to detect microvariability in obscured type 2 quasars. At the end of this paper, we discuss possible causes of microvariability. One of the options is the misclassification of the targets. A likely scenario for explanation of the phenomenon involves optically thin gaps in a clumpy obscuring medium, in accordance with the present view of the circumnuclear region. There is a possible interesting connection between the merging state of the targets and detection of microvariability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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